Twenty percent of the electricity in Germany is generated from sustainable resources. Much of this is generated by wind farms in northern Germany and consumed in the southern part of the country. On especially windy days, the flow of electricity is spilling across Germany’s borders and straining the power grids in neighboring countries. Now the Czech Republic is saying it will install security switches to avoid potential overload and blackouts.
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Czech Republic/Germany: The Czech Republic on the Verge of a Blackout http://www.dw.de/european-journal-the-magazine-from-brussels-2013-01-09/e-16469500-9798